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material design stress  
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Posted by: Albert ^{®} 12/16/2004, 04:58:09 Author Profile Mail author Edit 
For ductile material, I have been using material shear yield stress = 0.58 x material tension yield stress.....and also bearing yield stress = 1.6 material tensin stress. I prepared the design calculation and the third party reviewer asked how I support the above figure. Does anyone know of the source reference? One book refer the bearing stress back to ASME code on rivet design. 
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Re: material design stress  
Re: material design stress  Albert  Post Reply  Top of thread  Forum 
Posted by: crbeebe ^{®} 01/15/2005, 22:56:10 Author Profile Mail author Edit 
The 0.58 factor can be derived from the VonMises criterion. VonMises criterion is a failure theory that is based on the 3D stress state, and yields a scalar value for stress—the “von Mises stress”. Per the theory, failure occurs when the VM stress exceeds the tensile strength of the material. For your example, let’s assume a pure shear state in the material in a single plane. The VM equation for such a stress state reduces to VM stress = sqrt ( 1/2 * (6* tau^2 )) = sqrt (3) * tau where “tau” is shear stress. Since the shear state is assumed to be pure shear stress, failure will occur when tau reaches the shear strength (“tauyield”) of the material. And, since failure occurs when the VM stress exceeds the tensile strength of the material, VM stress = tensile strength = sqrt (3) * tauyield
I don’t have a source for the 1.6 bearing stress factor.

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Re: material design stress  
Re: Re: material design stress  crbeebe  Post Reply  Top of thread  Forum 
Posted by: Albert ^{®} 01/16/2005, 20:20:30 Author Profile Mail author Edit 
Crbeebe....thanks for the help. 
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